Attachment for cantaliver-springs



P. PJRWITZ.

ATTACHMENT FOR GANTALIVER SPRINGS. APPLICATION HLED'APR. 19, 921.

1, 1, 5 Patentedfiept. 27,1921.

UNITED STATES, PATENT OFFICE.

PAUL PIRWITZ, OF MARSHFiELD, WISCONSIN. A P

ATTACHMENT FOR CANTALIVER- SPRINGS.

To all whom it may concern:

Be it known that I, PAun-Pmwrrz, a citi- 1 zen of theUnited States, residing at Marshfield, in-the county of Wood and State of 5 Wisconsin, have invented certain new and useful Improvements in Attachments for Cantaliver Springs, of which the following is a specification. a 7

My; invention relatesto attachments for 10- cantaliver springs and more particularly to shock-absorbers for springs of this class used in connection with fast moving vehicles, such as automobiles and the like.

My object'is to provide an attachment of I veniently attached to any ordinary canta liver spring. v

Anotherobject in view is to provide a deshocks, is specially adapted to absorb end shocks, as for instance,when both front wheels of a fast moving car simultaneously strike 'an'obstruotion. Y r Minor objects will appear'in the subj oined description. I

The invention consists in the novel construction and arrangement ofthe several parts, as will be hereinafter described and claimed, reference being had to the accompanying drawings, in which a Figure 1 is a side'elevation of a front spring provided with'my attachment; and Fig. 2 is a similarview of a rear spring, the parts constituting the invention being in 'dicated" in both figures by shading Referring further to the drawings, the

i numeral 1 indicates the'frame of the vehicle,

401and 2, a cantaliver spring of any ordinary or preferred construction'operatively mounted thereon. My attachment consists of as.

' lower auxiliary spring 3,composed preferably of a fewer number of leaves thanthe cantaliver spring 2, and rigidly mounted on the;

I axle 4 'of the vehicle by means of a lbolt 5 and a 'clip 6. Another clip '7, located bej tween the clip 6'and'the inner end of the .8, which is rigidly secured to the inner end of the cantaliver spring 2 by one of the bolts 9 which secures said spring to the vehicle name 1. a

vice of this character which, while assisting the oantaliver spring totake up vertical 7 heavy outer end'l of [the 'lowerauxiliary The outer or heavy end of -the auxiliary spring 3 extends outwardly beyondthe'axle plv-fl Specification of Letters Patent. P t t s pt27, '192 Application filed April 19, 1921. SerialNo. 462,558. i v

sists of a single leaf 11 rigidly secured'to I the underside of thecantaliver spring 2. It

projects outwardly over theouter ,end of the auxlllary spr1ng'3 and curves downwardly and inwardly and is pivotally connected at its lovverend to, the lower en d of ithe shackle 10 below theouter end of the auxiliaryfspring 3, wherebylthe upperandlower yielding portlons' of my dev ce are adapted for limited long tudinal movementrelatively to each other, whichprovesto be of great advantage in absorbing end shocks, as will be pointed out more fully farther 'on. p i

It will also be observedthat withmypresent arrangement, the outer springy end of theiupper leafll is connected with the,

the cantaliver: spring '2.

[the bracket 8"with the heavyinner end of i The per leaf .11 sagas held gainst longitudinal movement on" the cantaliver spring 2 by means of a b01512 at'the outer end of said spring. Theclips '13 further assist 1 in holding the upper leaf 'll in ifirm engagement with the, underside of the cantaliver spring, while at thesame time permitting theseparate leaves which""form said spring to glide upon each other as the spring moves up and down. a

Whil the attachments for the front and rear springs are alike in mechanical principle and construction, yet in the front spring, the heavy end of the auxiliary spring 3 is theforward end,whereaslthereverse is true of the rear spring. v v s In the operation of my device it WlllbG "seen that having the upper leaf 11 project as it does over the outer end of the lower auxiliary spring 3, enables said upper leaf-to be made longer, and consequently more"" lower endofthe shackle 10, permits the emspringy than wouldotherwise be possible; a and the fact that the leaf; ,11 engages the ployment of a greater curve at the outer end of said upper leaf. It is also pointed out that the shackle-10 may be made of dnferent t lengths,v and when desired; longer than; is shown in the drawings, so that without changing the lower auxiliaryjspring 3, an a may be employed with the same vehicle.

It is apparent that a cantaliver spring providedwith my attachment will have a greater vertical travel, but particular attention is called to the special adaptability of the device toabsorb end shocks, as for instance,

when the front wheels of a rapidly moving vehicle simultaneously strike an obstruction or depression in the roadway, Since the axle is fastened to the lower auxiliary springs 3, the major part of the endwise shock as just described, will be imposed upon said auxiliary spring, and asthe heavy end of the front auxiliary spring is the for- .ward end thereof, the strain imposed'upon the spring will be in the direction of its greatest resiliencya concave strain, so to speak, instead of a convex. The outer curvedend of theupper leaf 1'1 cooperates sufliciently withthe auxiliary spring 3 to instantly recover the front wheels to their original position after an initial endwise shock, and thereby alsoprecludes the possibility' of breakingfthe inner leaf of the auxiliary spring 3. i i r j The fact that the lower auxiliary'spring 3vprojects outwardly a material distance beyond the axle to which it is secured, servesto permit the upper leaf 11 to be made longer and consequently more springy. r

The great practical value of the above arrangementbecomes apparent, when it is; consideredthatend shocks in rapidly moving vehicles are verysudden but not very great, whereas the vertical'strain is often comparatively great. In the construction shown, theauxiliary spring 3 yields to end shock on the front wheels in the direction ofits least strength and greatest resiliency, but r'esists vertical shock in the direction of its greatest strength and power of resistance. i

The curvature of the inner .end of the auxiliary spring 3'may be made greater or less according to the peculiar'requirements ofeachfcase or the preferences of the individual user, and hence in the drawings I have shown one" of these auxiliary springs provided at its inner end-with avery con= siderable curve, and theother with a much less curve.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is i i 1. A device of the character described,- comprising anupper section adapted to be secured to theunder side of. a cantaliver spring; a lower auxiliary spring section adapted to be secured, at a point spaced inwardly from the outer end thereof, to the axle of the vehicle; a shackle pivotally con necting the outer end of the upper section with the'projecting outer end ofthe lower secured to the under side of a caltaliver spring; a lower auxiliary spring section adapted to be secured, at a point spaced inwardly from the outer'end thereof, to the axle of the vehicle; a downwardly extending shackle pivotallyco'nnected at its upper end to the projecting outer end of the lower section, with the outer end of the upper section projecting outwardly over said shackle and curving" downwardly and inwardly and pivotally connected at its lower end with the" lower end'of the shackle; and means at the inner end ofthe lower section for pivotally connecting the same to a fixed-bearin 3.x device of the character; describe comprising an upper section adapted to be secured to'the under side ofa' cantaliver spring; a lower auxiliary 1 spring section T composed of a plurality of leaves, with its heavyend outward, and adapted to be'secured, at a pointspaced inwardly from said outer end,lt o the axle of the vehicle; a downwardly extending shackle pivotally connected at its upper end to the projecting outer 1 end of the lower section, with the outer end of the upper section"projecting outwardly *over said'sh'ackle and curving downwardly and inwardly and pivotal'lyconnected at its lower endwith thelower end of the shackle; and means at the inner end of the'lower sec-. tion for"pivotally'c'onnecting thesame to a AMA device of the 1 character described,

comprising an upper section formed-of a single leaf adapted to'be secured to the under side of a-cantaliver spring in'flat engag'ement therewith a lower auxiliary spring section, composed of a plurality of leaves, with its heavy end outward, and adapted to be secured at; a point spaced inwardly from said outer end to-the axle of the'vehicle; a downwardly extending shackle pivotally connected at its upper end to;the projectingouter end of the lower section with the-outer end of the upper leaf section projecting outwardly over the shackle on the outer projecting end of the lowersection and curved downwardly and inwardly and pivotallyconn'ected at its lower end with the lower end of the shackle; and means at the inner end of the lower sectionfor pivotally connecting the upper leaf thereof to a fixed bearing. 7 i v a Y 5. In a-device of the character'described for thefront wheel of a vehicle, an upper section-adapted to be secured to the under side of a cantaliver spring; a lower auxiliary spring section resilient and springy at its inner end and comparatively rigid at its outer forward end and adapted to be secured, at a point spaced inwardly from said forward end, to the axle of the vehicle; a downwardly extending shackle pivotally connected at its upper end to the forwardly projecting end of said lower section, with the outer end of the upper section projecting outwardly over said shackle and curved downwardly and inwardl and ivotally connected at its lower en with t e lower end of the shackle, the inner end of said lower section to which the axle is attached axle of the vehicle will press said lower spring section in the line of its least resistance.

In testimony whereof I afiix my signature. 20

PAUL PIRWITZ. 

